<template>
  <view>
    <!-- 使用自定义组件 -->
    <!-- <my-search :bgcolor="''"  :radius="18"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
  <view class="scrool-view-container">
    <!-- 左侧滑动区域 -->
    <scroll-view scroll-y :style="{height:wh+'px'}" class="left-scroll-view">
      <block v-for="(item,index) in cateList" :key="index">
        <view :class="['left-scroll-item',index===active ? 'active':'']" @click="activeChanged(index)">{{item.cat_name}}</view>     
      </block>                                                
    </scroll-view>
    <!-- 右侧滑动区域 -->
    <scroll-view scroll-y :style="{height:wh+'px'}" :scroll-top="scrollTop">
     <view class="cate-lv2" v-for="(item2, i2) in catelevel" :key="i2">
       <!-- 二级标题 -->
        <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
        <!-- 三级路由 -->
        <view class="cate-lv3-list">
              <!-- 三级分类 Item 项 -->
              <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                <!-- 图片 -->
                <image :src="item3.cat_icon"></image>
                <!-- 文本 -->
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
      </view>
    </scroll-view>
  </view>
  </view>
</template>

<script>
  import badgeMix from "@/mixins/tabbar-badge.js"
  export default {
     mixins:[badgeMix],
    data() {
      return {
        wh:0 ,// 当前设备可用高度
        // 分类列表
        cateList:[],
        active:0, // 当前选中项的索引
        catelevel:[],  //二级分类列表
        scrollTop:0  // 滚动条距离顶部得距离
      };
    },
    methods:{
     async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
         // 判断请求是否失败
        if(res.meta.status!==200) return uni.$showMsg()
        this.cateList=res.message
        // 为二级标题赋值
        this.catelevel=res.message[0].children
      },
      activeChanged(ind){
        // 将当前的激活索引赋值给active
        this.active=ind
        // 显示对应的二级标题
        this.catelevel = this.cateList[ind].children
        this.scrollTop=   this.scrollTop===0?1:0
      },
      // 跳转到商品列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:"/subpkg/goods_list/goods_list?cid="+item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'../../subpkg/search/search'
        })
      }
    },
    onLoad(){
      // 获取当前设备状态
      const sysInfo=uni.getSystemInfoSync()
      // 得到当前得可用得视图高度
      this.wh=sysInfo.windowHeight-50
      this.getCateList()
    }
  }
</script>

<style lang="scss">
.scrool-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
  }
  .left-scroll-item{
    background-color: #F7F7F7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;
    &.active{
      background-color: #fff;
      position: relative;
      &::before{
        content: '';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #C00000;
        position: absolute;
        top:50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
